Transaction not yet indexed

668C88aTooCBuhPLRbtsECkE1CqPPrDhePBu5uLgQ4jmhQQxxtaqpx2ZW7A1pgPBeVwNXFUhep1GL2SCym1dZdMn

The transaction signature is valid but not yet indexed by this RPC node, or the transaction failed before inclusion.